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` J. K. TUFTS.

TOOL HOLDER.

APPLICATION HLED MAY 31. 1917.

Patent@ June A10, 1919.

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J. K. TUFTS.

TOOL HOLDER.

APPLICATION HLED MAY 31. lsu.

1,306,039. Patented June 10, 1919i.

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CIT

JAMES K. TUFTS, OF BOSTON, MASSACHUSETTS.

ilf l Toon-HOLDER.

Specification of Letters Patent.

Patented J une 10, 1919.

Application led May 31, 1917. Serial No. 171,810.

T o all whom t may concern:

Be it known that I, JAMES K. Tnr'rs, a subject of King George V ofEngland, residing at Boston, in the county of Suffolk and State ofMassachusetts, have invented new and useful Improvements in Tool-Holders, of which the following is a specilication.

This invention relates to an improved tool holder to be used inconnection with the tool post of a lathe, planer or Shaper. The cuttingtools of metal are made of very expensive steel and it is the object ofthis invention to provide a holder for such tools which will firmlyclamp a small piece of steel, formed as a cutter, to a holder such as ispracticable in form and size to be used in connection with the tool postof a lathe, planer or Shaper.

It is further the object of this invention to provide a device of thecharacter set forth in which the tool is clamped to the holder in such amanner as not to injure the same by cracking it or by causing it to becrystallized at certain portions thereof so that it will break whenpressure is applied thereto.

The invention consists in a tool holder having a recess therein adaptedto receive a tool and certain specific means for firmly clamping eithera short or long tool to said holder, as set forthy in the followingspecification and particularly pointed out in the claims.

The invention further consists of a device of the character set forth inwhich the holder is so mounted that it can be rotated so as to place thetool holder thereof at different angles according to the nature of thework being performed.

The invention still further consists in the combination and arrangementof parts set forth in the following specification and particularlypointed out in the claims thereof.

In the accompanying drawings I have illustrated several forms embodyingmy invention, all of said forms, however, containin the same fundamentalprinciples and il ustrating the different ways in which' my inventionmay be used to suit varying classes of work.

Referring to the drawings:

Figure 1 is a side elevation of one embodiment of my invention, the samebeing particularly adapted to be used in connection with the tool postof a lathe.

Fig. 2 is a plan view of the same.

Fig. 3 is aside elevation of another embodiment of my invention, alsoadapted to be used in connection with the tool post of a lathe. Fig. 4is a plan view of that form of my invention illustrated in Fig. 3.

Fig. 5 is a side elevation of another embodiment of my invention whichis adapted to be used particularly in connection with the tool post of aplaner or Shaper.

Fig. 6 is a plan view of the form of my invention illustrated in Fig. 5.

Fig. 7 is a side elevation of another embodiment of my inventionillustrating the tool holder rotatably mounted upon a supporter which isadapted to be used in connection with the tool post of a planer orshaper. n

Fig. 8 is a plan view of the form of my invention illustrated in Fig. 7.

Like numerals refer to like parts throughout the several views of thedrawings.

In the drawings, referring to Figs. 1 and 2, 10 is the holder, and 11the tool which projects into a hole 12 in which it forms a sliding fit.The hole 12 extends longitudinally through the holder at an anglethereto and is intersectedby a slot 13 which extends at an acute angleto said hole 12 and in which is located a clamping lever 14 pivoted tothe holder' 10 by means of a pivot 15. A screw 16 has screw-threadedengagement with the lever 14 and the inner end thereof projects into arecess 17 formed in the bottom of the slot 13, the metal in theimmediate vicinity of said recess being hardened. f

It will be noted that the inner'end of the screw 16 bears against a'portion of the holder 1() which projects between the bottom of the slot13 and the top of the hole 12, so that whether the piece forming thetool 11 is long enough to extend entirely through the hole 12, or only avery short distance into said hole, the screw 16 will bear against saidportion of the holder 10, and will clamp the tool, whether long orshort, into the hole 12 under exactly the same conditions.

It .will be noted that the clamp lever 14 has one edge 18 thereofarranged to contact with vthe tool 11 on both sides 0f a plane A-A whichextends transversely of the tool 11 and hole 12 and at right angles tothe bottom of said hole and passes through the median axial line of saidpivot 15, so that said edge 18 bears along the upper edge of the tool 11from the front of the holder 10 to and beyond the plane A-A, andconsequently it will llle.56.6.1.15011.313 When the screw 16 is operatedto rock the clamp lever 14 upon its pivot 15, it will .bear

against the upper edge of the tool 11 for a substantial distance from,the plane A-A and will have'no tendency to nick or crystallize saidtool to make it crack. Moreover, if the tool 11 is very short, the edge18 of the lever 14 will have a firm hold and comparatively long bearingthereon.

It will be seen lthat as the lever 14 is operated, as hereinbefore setforth, to clamp the tool in the holder, the'portion of the edge 18in'nnediately adjacent to the plane A-A will act ,as a wedge between thepivot 15 and the tool 11 to vfirmly clamp said tool to the holder andthat any force exerted upon the tool 11 during its operation in cuttingmetal which tends to'force said tool backwardly vin the hole 12 willcause the clamping Vaction of the lever 14 to be increased `and the toolto be thus still more firmly .held and clamped within the ,holder 10.

The edge 19 of the lever 14, it will be seen, extends at an angle to theedge 18 of said lever and along adjacent to the b ot-l tom of the slot13, so that there is vopportunity for a substantial amount of metal oflthe holder 10 to project between the bottom edge 19` of the lever 14andthe top edge of the hole 12, so that a substantial and strong baseisprovided against which the screw 16'V bears. j

The operation of the tool is as follows; The holder 10 isinserted in thetool post of a lathe in the usual manner. The'tool'll v is placed'in thehole 12 and is lampedztherein by means of the lever 14 and clampingscrew 16. Turning said screw to advance the same causes the lever 14 toclamp the tool in the hole 12 and vice versa.

Now referring to Figs. 3 and 4, 2O is the holder, 21' vthe tool, 22 thehole in which said tool is seated, 23 the slot for the clamping lever24, which lever is pivoted at 25`and is tipped upon said pivot by aclamping screw 26, the lower end of which bearsl against a` recess 27 inthe holder 20. The edge (28. bears against the tool 21 and the edge 29of said lever stands at an angle to the edge 28 andy at a slightdistance from the bottom of the slot 23. In this embodi-` ment of myinvention it will be seen that the edge 28,'which contacts with the tool21, extends on oppositel sides of aplane B which stands at right anglesto theedge of the tool 21 and contains'the median axial line, of: thepivot 25.

In the form of my invention illustrated in Figs. 5 and 6, 30-y isthe'holder,31 the tool, 32 the hole in which said tool is seated, 334.the slot in which the lever 34 is located. 35 is the pivot lof said,lever 34, 36 the 4the kedge .of .the .lever which bears against the tool31 and 39 the edge of said lever which extends at an angle to the edge38 and adjacent to the bottom of the slot 33.

4It will be noted that the plane C which contains the median axial lineof the pivot 35 intersects the contacting edge 38 of the lever 34 at asubstantial distance from the point where the'tool projects from thefront of the holder 30.

In Figs. 7 and 8 a modified ferm of my invention is embodied in whichthe tool holder' is rotatable so that the tool may be presented atdifferent angles to the work. In this embodiment of 'my invention 40 isthe holder, 41 the tool, 42 the hole in ,which said tool is seated, 43the slot in which -the clamp lever 44 is located, said clamp lever beingpivoted at 45 tothe holder 40. '14,6 is the clamp screw which tips theholder upon its pivot in order that the edge 48 of said levermay bearVagainst the edge of the tool 41 andclamp the vsame in the holder. Itwill be noted that the edgel 48 stands at an angle to the Iedge .49ofsaid lever.l 4

The holder 40 has `a shank .540 which is rotatably mounted in asupporting member 51, the Ishank 52 of said snpport'ingmenr berprojecting into the tool post of a planer or Shaper in the usual manner.Said ktool holderf40 is locked in position by means of'a pin 5,3 whichprojects into any one of the recessesv 54 provided in the upper edgeofthe boss 5,5 of the supporting" member 51 and is clamped in 'positionby means of nut 5 6 having screw-threaded engagement with the ,shank50.., v

vThe general operation of the diii-erent embodiments of my invention issubstantially the same, except that in the form of my inventionillustrated vin Figs. Z and 8 the tool can beset at,k dierent anglestothe snpporting member 51 while'the supporting member remains inthetool post, Having thus described .'my invention, what I claim anddesire by Lettersl Patent to secure is: A 1. A tool holder having, incombination, a holding member having a .recess therein adapted toreceive a tool', saidV holding member also being provided with aslot'intersecting said recess, a clamping lever located in said slotpivoted to said holding member j and arrangedto bear against a toollocated a holding member having a hole extending' therethrough adaptedto receive al tool', said holding member also being. provided'y with aslot intersecting said hole, a portion of said holding member projectinglbetween said hole and slot and forming the bot-tom of said slot, aclamping lever located in said slot pivoted to said holding member andarranged to bear against a tool located in said slot and a screw havingscrew-threaded engagement with said lever and adapted to bear againstsaid portion of said holding member which forms the bottom of said slot.

3. A tool holder having, in combination, a. hole extending therethroughadapted to receive a tool, said holding member also being provided witha slot intersecting said hole, a portion of said holding member projecting between said hole and slot and forming the bottom of said slot, aclamping lever located in said slot pivoted to said holding member andarranged to bear against a tool located in said slot and a screw havingscrew-threaded engagement with said lever and adapted to bear againstsaid portion of said holding member projecting between said hole andslot, said holding member having a recess therein into which the end ofsaid screw is adapted to project.

4. A tool holder having, in combination, a holding member having arecess therein adapted to receive a tool, said holding member also beingprovided with a slot intersecting said recess, a clamping lever 1ocatedin said slot, Aa `pivot connecting said clamping lever to said holdingmember, one edge of said clamping lever adapted to contact with a toollocated in said recess from the front end of said hole to the point insaid hole nearest said pivot.

5. A tool holder having, in combination, a holding member having arecess therein adapted to receive a tool, said holding member also being,provided with a slot intersecting said recess, a clamping lever located'in said slot and pivoted to said holding member, said clamping leverhaving one edge thereof arranged to contact with said tool for asubstantial distance and another edge thereof eXtendin at an angle tosaid contacting edge and a jacent to the bottom of said slot and a screwhaving screwthreaded engagement with said lever and adapted to bearagainst the bottom of said slot.

6. A tool holder having, in combination,

a holding member having a recess therein adapted to receive a tool, saidholding member also being provided with a slot intersecting said recess,a clamping lever located in said slot and pivoted to said holdingmember, said clamping lever having one edge thereof arranged to contactfor a substantial distance with a tool located in said recess andanother edge thereof extending at an angle to said contacting edge andadjacent to the bottom of said slot and a screw having screw-threadedengagement with said lever projecting through said lastnamed edge andadapted to bear against a portion of said holding member located betweensaid lever and said recess.

7. A tool holder having, in combination, a holding member having arecess therein adapted to receive a tool, said holding member also beingprovided with a slot intersecting said recess, a clamping lever locatedin said slot, a pivot connecting said clamping lever to said holdingmember, said clamping lever having one edge thereof arranged to contactwith a tool located in said recess for a substantial distance from thefront end of said recess toward a plane eX- tending transversely of andat right angles to the bottom of said recess and containing the medianaxial line of said pivot and a screw having screw-threaded engagementwith said lever and adapted to bear against the bottom of said slot.

8. A tool holder having, in combination, a supporting member, a holdingmember rotatably mounted upon said supporting member, ber to saidsupporting member, said holding member having a recess therein adaptedto receive a tool and being also provided with a slot intersecting saidrecess, a clamping lever located in said slot pivoted to said holdingmember and arranged to bear against said tool and a screw havingscrewthreaded engagement with said lever and adapted to bear againstsaid holding member outside said recess.

In testimony whereof I have hereunto set my hand in presence of twosubscribing witnesses.

JAMES K. TUFTS. Witnesses:

CHARLES S. GooDINe, SYDNEY E. TAr'r.

Copies of this patent may be obtained for ve cents each, by addressingthe Commissioner of Patents, Washington, I). C.

means to lock said holding memf

